User plane entity and control plane entity of wireless communication system, and operation methods thereof

Abstract

A user plane entity of a wireless communication system including the user plane entity and a control plane entity according to an embodiment may comprise: a at least one processor, comprising processing circuitry, individually and/or collectively, is configured to: detect whether a session message, which has been transmitted to the control plane entity by the user plane entity, for the volume quota allocation of a resource of the user plane entity is lost; generate a session message, including an arbitrary usage report, based on the session message being detected as being lost; and a communication interface, comprising communication circuitry, is configured to transmit the session message including the usage report to the control plane entity to attempt volume quota allocation.

What is claimed is: 
     
         1 . A user plane entity of a wireless communication system comprising the user plane entity and a control plane entity, the user plane entity comprising:
 at least one processor, comprising processing circuitry, individually and/or collectively, configured to: detect whether a session message for volume quota allocation for a resource of the user plane entity, transmitted by the user plane entity to the control plane entity, is lost, and generate a session message comprising an arbitrary usage report based on detecting that the session message is lost; and   a communication interface, comprising communication circuitry, configured to transmit the session message comprising the usage report to the control plane entity to attempt the volume quota allocation.   
     
     
         2 . The user plane entity of  claim 1 , wherein at least one processor, individually and/or collectively, is configured to detect whether the session message is lost based on at least one of a maximum number of retransmission of the session message and a time at which a transmission failure of the session message is recognized. 
     
     
         3 . The user plane entity of  claim 1 , wherein at least one processor, individually and/or collectively, is configured to generate a session message in which usage of the arbitrary usage report is set to 0. 
     
     
         4 . The user plane entity of  claim 1 , wherein the arbitrary usage report comprises at least one of:
 a usage report in which a trigger for the volume quota allocation is set; and   a usage report in which a start trigger for informing the start of traffic transmission and volume quota allocation is set.   
     
     
         5 . The user plane entity of  claim 1 , wherein
 at least one processor, individually and/or collectively, is configured to generate the session message in which a user plane inactivity report (UPIR) bit requesting session deletion among report types of the session message is set, and   the communication interface is configured to transmit the session message in which the UPIR bit is set to the control plane entity.   
     
     
         6 . The user plane entity of  claim 1 , wherein at least one processor, individually and/or collectively, is configured to attempt the volume quota allocation, to repeatedly retransmit the session message comprising the usage report to the control plane entity a specified number of times. 
     
     
         7 . The user plane entity of  claim 6 , wherein
 based on a time set by the control plane entity for the user plane entity elapsing, or the volume quota allocation not being provided while the repeated retransmission is performed the specified number of times, at least one processor, individually and/or collectively, is configured to request session deletion by transmitting the session message, in which the UPIR bit requesting the session deletion is set, to the control plane entity, and   the communication interface is configured to, based on determining that one of a session corresponding to the session deletion request and a resource of the control plane entity is not present in the control plane entity, receive a session deletion request message requesting deletion of a resource corresponding to the session, transmitted from the control plane entity.   
     
     
         8 . A control plane entity of a wireless communication system comprising a user plane entity, the control plane entity, and an online charging server (OCS), the control plane entity comprising:
 at least one processor, comprising processing circuitry, individually and/or collectively, configured to: detect whether a session message, in which a user plane inactivity report (UPIR) bit requesting session deletion among report types of the session message is set, is received from the user plane entity, and determine whether a session requested by the user plane entity and a resource for the session are present according to the reception of the session message; and   a communication interface, comprising communication circuitry, configured to transmit a message requesting a credit update of the user plane entity to the online charging server based on the determination whether the session and the resource for the session are present.   
     
     
         9 . The control plane entity of  claim 8 , wherein
 at least one processor, individually and/or collectively, is configured to, based on determining that the session and the resource for the session are present, generate a message requesting the credit update in which usage is set to 0, and   the communication interface is configured to transmit the message requesting the credit update in which the usage is set to 0 to the online charging server.   
     
     
         10 . The control plane entity of  claim 8 , wherein
 at least one processor, individually and/or collectively, is configured to, based on determining that the session and the resource for the session are not present, generate a message requesting deletion of the resource corresponding to the session requested by the user plane entity, and   the communication interface is configured to transmit the message requesting the deletion to the user plane entity.   
     
     
         11 . A method of operating a user plane entity in a wireless communication system comprising the user plane entity and a control plane entity, the method comprising:
 detecting whether a session message for volume quota allocation for a resource of the user plane entity, transmitted by the user plane entity to the control plane entity, is lost;   based on detecting that the session message is lost, generating a session message in which usage of an arbitrary usage report is set to 0; and   attempting the volume quota allocation by transmitting the session message comprising the usage report to the control plane entity.   
     
     
         12 . The method of  claim 11 , wherein the detecting of whether the session message is lost comprises detecting whether the session message is lost based on at least one of a maximum number of retransmission of the session message and a time at which a transmission failure of the session message is recognized. 
     
     
         13 . The method of  claim 11 , wherein the attempting of the volume quota allocation comprises:
 generating the session message in which a user plane inactivity report (UPIR) bit requesting session deletion among report types of the session message is set; and   transmitting the session message in which the UPIR bit is set to the control plane entity.   
     
     
         14 . The method of  claim 11 , wherein the attempting of the volume quota allocation comprises:
 attempting the volume quota allocation by repeatedly retransmitting the session message comprising the usage report to the control plane entity a specified number of times;   based on a time set by the control plane entity for the user plane entity elapsing, or the volume quota allocation not being provided while the repeated retransmission is performed the specified number of times, requesting session deletion to the control plane entity by transmitting the session message, in which the UPIR bit requesting the session deletion is set; and   based on determining that one of a session corresponding to the session deletion request and a resource of the control plane entity is not present, receiving a session deletion request message requesting deletion of a resource corresponding to the session from the control plane entity.   
     
     
         15 . A method of operating a control plane entity in a wireless communication system comprising a user plane entity, the control plane entity, and an online charging server (OCS), the method comprising:
 receiving a session message, in which a user plane inactivity report (UPIR) bit requesting session deletion among report types of the session message is set, from the user plane entity;   determining whether a session requested by the user plane entity and a resource for the session are present based on reception of the session message; and   transmitting a message requesting a credit update of the user plane entity to the online charging server based on determining whether the session and the resource for the session are present,   wherein the transmitting of the message requesting the credit update comprises:
 based on determining that the session and the resource for the session are present, transmitting a message requesting the credit update in which usage is set to 0 to the online charging server; and 
 based on determining that the session and the resource for the session are not present, transmitting a message requesting deletion of the resource corresponding to the session requested by the user plane entity to the user plane entity.